diff --git a/lib/vsprintf.c b/lib/vsprintf.c
index a6e1951..6438cd5 100644
--- a/lib/vsprintf.c
+++ b/lib/vsprintf.c
@@ -624,13 +624,19 @@
 		.precision = -1,
 		.flags = SPECIAL | SMALL,
 	};
-	/*
-	 * room for three actual numbers (decimal or hex), plus
-	 * "[mem 0x-0x 64bit pref disabled flags 0x]\0"
-	 */
-	char sym[3*3*sizeof(resource_size_t) + 41];
+
+	/* 32-bit res (sizeof==4): 10 chars in dec, 10 in hex ("0x" + 8)
+	 * 64-bit res (sizeof==8): 20 chars in dec, 18 in hex ("0x" + 16) */
+#define RSRC_BUF_SIZE		((2 * sizeof(resource_size_t)) + 4)
+#define FLAG_BUF_SIZE		(2 * sizeof(res->flags))
+#define DECODED_BUF_SIZE	sizeof("[mem - 64bit pref disabled]")
+#define RAW_BUF_SIZE		sizeof("[mem - flags 0x]")
+	char sym[max(2*RSRC_BUF_SIZE + DECODED_BUF_SIZE,
+		     2*RSRC_BUF_SIZE + FLAG_BUF_SIZE + RAW_BUF_SIZE)];
+
 	char *p = sym, *pend = sym + sizeof(sym);
 	int size = -1, addr = 0;
+	int decode = (fmt[0] == 'R') ? 1 : 0;
 
 	if (res->flags & IORESOURCE_IO) {
 		size = IO_RSRC_PRINTK_SIZE;
@@ -641,15 +647,17 @@
 	}
 
 	*p++ = '[';
-	if (fmt[1] == 't' || fmt[1] == 'f') {
-		if (res->flags & IORESOURCE_IO)
-			p = string(p, pend, "io  ", str_spec);
-		else if (res->flags & IORESOURCE_MEM)
-			p = string(p, pend, "mem ", str_spec);
-		else if (res->flags & IORESOURCE_IRQ)
-			p = string(p, pend, "irq ", str_spec);
-		else if (res->flags & IORESOURCE_DMA)
-			p = string(p, pend, "dma ", str_spec);
+	if (res->flags & IORESOURCE_IO)
+		p = string(p, pend, "io  ", str_spec);
+	else if (res->flags & IORESOURCE_MEM)
+		p = string(p, pend, "mem ", str_spec);
+	else if (res->flags & IORESOURCE_IRQ)
+		p = string(p, pend, "irq ", str_spec);
+	else if (res->flags & IORESOURCE_DMA)
+		p = string(p, pend, "dma ", str_spec);
+	else {
+		p = string(p, pend, "??? ", str_spec);
+		decode = 0;
 	}
 	hex_spec.field_width = size;
 	p = number(p, pend, res->start, addr ? hex_spec : dec_spec);
@@ -657,21 +665,19 @@
 		*p++ = '-';
 		p = number(p, pend, res->end, addr ? hex_spec : dec_spec);
 	}
-	if (fmt[1] == 't' || fmt[1] == 'f') {
+	if (decode) {
 		if (res->flags & IORESOURCE_MEM_64)
 			p = string(p, pend, " 64bit", str_spec);
 		if (res->flags & IORESOURCE_PREFETCH)
 			p = string(p, pend, " pref", str_spec);
 		if (res->flags & IORESOURCE_DISABLED)
 			p = string(p, pend, " disabled", str_spec);
-		if (fmt[1] == 'f') {
-			p = string(p, pend, " flags ", str_spec);
-			p = number(p, pend, res->flags & ~IORESOURCE_TYPE_BITS,
-				   flag_spec);
-		}
+	} else {
+		p = string(p, pend, " flags ", str_spec);
+		p = number(p, pend, res->flags, flag_spec);
 	}
 	*p++ = ']';
-	*p = 0;
+	*p = '\0';
 
 	return string(buf, end, sym, spec);
 }
@@ -847,10 +853,8 @@
  * - 'f' For simple symbolic function names without offset
  * - 'S' For symbolic direct pointers with offset
  * - 's' For symbolic direct pointers without offset
- * - 'R' For a struct resource pointer, print:
- *       R   address range only ([0x0-0x1f])
- *       Rt  type and range ([mem 0x0-0x1f 64bit pref])
- *       Rf  type, range, and flags ([mem 0x0-0x1f 64bit pref flags 0x1])
+ * - 'R' For decoded struct resource, e.g., [mem 0x0-0x1f 64bit pref]
+ * - 'r' For raw struct resource, e.g., [mem 0x0-0x1f flags 0x201]
  * - 'M' For a 6-byte MAC address, it prints the address in the
  *       usual colon-separated hex notation
  * - 'm' For a 6-byte MAC address, it prints the hex address without colons
@@ -881,6 +885,7 @@
 	case 'S':
 		return symbol_string(buf, end, ptr, spec, *fmt);
 	case 'R':
+	case 'r':
 		return resource_string(buf, end, ptr, spec, fmt);
 	case 'M':			/* Colon separated: 00:01:02:03:04:05 */
 	case 'm':			/* Contiguous: 000102030405 */